EP4657483A1

EP4657483A1 - Double-break isolator switch

Info

Publication number: EP4657483A1
Application number: EP25178807.1A
Authority: EP
Inventors: Kai Wang; Chun Hui Liu; Chu Xiong WANG; Hong Bo YANG; Ting Hui LV; Chang yong HE; Bing Xiong DAN; Ming Ming Chen
Original assignee: Siemens Energy Global GmbH and Co KG
Current assignee: Siemens Energy Global GmbH and Co KG
Priority date: 2024-05-28
Filing date: 2025-05-26
Publication date: 2025-12-03
Also published as: CN118471724A

Abstract

A double-break isolator switch, comprising: a housing; a support fixed in the housing; a first contact seat, a second contact seat and a third contact seat, respectively disposed at a first side, a second side and a third side within the housing; a first moving contact, a second moving contact and a third moving contact, slidably supported on the support and respectively used to engage with the first contact seat, the second contact seat and the third contact seat; a connecting rod mechanism, connected to the first moving contact, the second moving contact and the third moving contact, and driven by a driving mechanism, so as to drive the first moving contact, the second moving contact and the third moving contact, such that the double-break isolator switch has a first working position and a second working position. In the first working position, the first moving contact is engaged with the first contact seat and the second moving contact is engaged with the second contact seat, and the third moving contact is separated from the third contact seat. In the second working position, the third moving contact is engaged with the third contact seat, and the first moving contact is separated from the first contact seat and the second moving contact is separated from the second contact seat.

Description

Technical Field

The present invention relates to a double-break isolator switch, in particular to a double-break isolator switch which moves in linkage with a grounding switch.

Background Art

In the field of electrical control, for example in gas-insulated metal-enclosed switchgear (GIS), a fast isolator switch must be provided to rapidly isolate current (e.g. busbar conversion current) when a circuit breaker opens.
At present, a conventional isolator switch has only one break point. Therefore, regardless of whether it is being used for busbar end interval expansion or a voltage tolerance test is being performed after installation of expansion equipment, it is necessary to de-energize the entire busbar, or even the entire power station, in order to prevent discharge by breakdown of the isolator switch. An isolator switch with such a structure is not convenient to use, and the opening/closing busbar conversion current and voltage are limited.
In addition, a conventional isolator switch must additionally be externally connected to a grounding switch module, for connection to ground. This is wasteful, and the isolator switch and grounding switch cannot be mechanically interlocked.

Summary of the Invention

In view of the above, the present invention proposes a double-break isolator switch which moves in linkage with a grounding switch, and which is capable of overcoming certain shortcomings in isolator switches in the prior art, namely that power needs to be shut off for expansion and testing, and interlocking with a grounding switch is not possible.
A double-break isolator switch according to the present application comprises: a housing; a support fixed in the housing; a first contact seat, a second contact seat and a third contact seat, respectively disposed at a first side, a second side and a third side within the housing; a first moving contact, a second moving contact and a third moving contact, slidably supported on the support and respectively used to engage with the first contact seat, the second contact seat and the third contact seat; a connecting rod mechanism, connected to the first moving contact, the second moving contact and the third moving contact, and driven by a driving mechanism, so as to drive the first moving contact, the second moving contact and the third moving contact, such that the double-break isolator switch has a first working position and a second working position. In the first working position, the first moving contact is engaged with the first contact seat and the second moving contact is engaged with the second contact seat, and at this time, the third moving contact is separated from the third contact seat. In the second working position, the third moving contact is engaged with the third contact seat, and at this time, the first moving contact is separated from the first contact seat and the second moving contact is separated from the second contact seat.
Two isolation break points and one grounding break point are integrated in the double-break isolator switch of the present invention, greatly reducing costs. Furthermore, mechanical interlocking and linked movement of a grounding switch and an isolator switch are achieved, i.e. when the isolator switch closes, the grounding switch will be certain to open, and when the isolator switch opens, the grounding switch will be certain to close, so safety is improved.
Furthermore, the connecting rod mechanism comprises: a first connecting rod with a first end and a second end, the second end of the first connecting rod being connected to a first end of the first moving contact; a second connecting rod with a first end and a second end, the second end of the second connecting rod being connected to a first end of the second moving contact; a third connecting rod with a first end and a second end, the second end of the third connecting rod being connected to a first end of the third moving contact; a connecting member with a first part and a second part opposite the first part, wherein the first end of the first connecting rod, the first end of the second connecting rod and the first end of the third connecting rod are all connected to the second part of the connecting member; and a swing arm, connected to the first part of the connecting member, wherein the swing arm swings around an axis of a rotation shaft under the driving action of the driving mechanism, thereby driving the connecting member to move, and thus causing the first connecting rod to drive the first moving contact, the second connecting rod to drive the second moving contact, and the third connecting rod to drive the third moving contact to slide in the support.
The first connecting rod, second connecting rod and third connecting rod move in linkage with the connecting member and the swing arm, so the connecting rod mechanism is structurally simple, achieving mechanical interlocking and linked movement of the grounding switch and the isolator switch, and ensuring the safety and reliability of the isolator switch.
Further, the first part of the connecting member comprises a groove, and a second end of the swing arm is connected in the groove and slidable in the groove. The cooperation of the connecting member and the swing arm by means of the groove is structurally simple and highly reliable.
Further, the rotation shaft is arranged at a first end of the swing arm, and the driving mechanism drives the rotation shaft to rotate, thus causing the swing arm to swing. The rotation shaft drives the swing arm directly, so the structure is simple and transmission efficiency is high.
Further, the connecting rod mechanism comprises: a first connecting rod with a first end and a second end, the second end of the first connecting rod being connected to a first end of the first moving contact; a second connecting rod with a first end and a second end, the second end of the second connecting rod being connected to a first end of the second moving contact; a third connecting rod with a first end and a second end, the second end of the third connecting rod being connected to a first end of the third moving contact; a connecting member with a first part and a second part opposite the first part, the first end of the first connecting rod being connected to the first part of the connecting member, and the first end of the second connecting rod and the first end of the third connecting rod being connected to the second part of the connecting member opposite the first part. The rotation shaft of the driving mechanism is connected to a middle part of the connecting member, so as to drive the connecting member to rotate, thus causing the first connecting rod to drive the first moving contact, the second connecting rod to drive the second moving contact, and the third connecting rod to drive the third moving contact to slide in the support. The middle part is located between the first part and the second part.
The first connecting rod, second connecting rod and third connecting rod move in linkage with the connecting member, so the connecting rod mechanism is structurally simple, achieving mechanical interlocking and linked movement of the grounding switch and the isolator switch, and ensuring the safety and reliability of the isolator switch.
Further, the double-break isolator switch also has a third working position, wherein, in the third working position, the first moving contact is separated from the first contact seat, and the second moving contact is separated from the second contact seat, and at the same time, the third moving contact is separated from the third contact seat; in the third working position, the double-break isolator switch is in a state in which an isolator switch and a grounding switch are both disconnected.
The third working position offers different intermediate working states, realizing a working state in which the double isolator switch is disconnected and the grounding switch is disconnected, and thus facilitating modification or expansion of the double-break isolator switch.
Further, the first connecting rod, the second connecting rod and the third connecting rod are connected by pins to the connecting member and the corresponding first moving contact, second moving contact and third moving contact respectively, in order to be able to rotate relative to the connecting member and the corresponding first moving contact, second moving contact and third moving contact respectively. The connection of the connecting rods to the moving contacts by pins is structurally simple and very low-cost.
Further, the connecting member has at least one recess, such that the connecting member has a U shape, the first connecting rod, the second connecting rod or the third connecting rod being inserted in the recess, and rotatably connected to the connecting member by a pin, so as to rotate within a certain range in the recess.
Further, the recess is located at a middle position in a thickness direction of the connecting member.
The connecting rod is inserted and rotatably fixed in the recess; with such a method of rotatable connection, the connecting rod is more stable and will not deviate during rotation.
Further, the double-break isolator switch further comprises a supporting member fixed to a fourth side of the housing, for supporting the support.
The double-break isolator switch according to the present invention integrates two isolation break points and one grounding break point, realizing three working position states: opening of both isolation break points, with closure of the grounding break point; closure of both isolation break points, with opening of the grounding break point; and opening of both isolation break points, with opening of the grounding break point. These three states are integrated in a single module, greatly reducing costs while improving safety. In addition, the grounding switch and the isolator switch are mechanically interlocked, enabling linked movement of the isolator switch and the grounding switch, thus improving safety and stability.
The double-break isolator switch of the present invention is flexibly configured; an isolation or grounding function can be chosen according to actual needs. At the same time, it enables expansion, overhaul or testing without shutting off power.

Brief Description of the Drawings

The drawings accompanying the description which form part of the present application are intended to provide further understanding of the present application. The schematic embodiments of the present application and the descriptions thereof are intended to explain the present application, but do not constitute an improper limitation thereof. In the drawings:

Fig. 1: is a sectional drawing of a double-break isolator switch of the present application, wherein an isolator switch is closed, and a grounding switch is disconnected.
Fig. 2: is a sectional drawing of a double-break isolator switch of the present application, wherein an isolator switch is disconnected, and a grounding switch is closed.
Fig. 3: is a side sectional drawing of a double-break isolator switch of the present application.
Fig. 4: is a sectional drawing of a double-break isolator switch in another embodiment of the present application, wherein an isolator switch is disconnected, and a grounding switch is closed.
Fig. 5: is a sectional drawing of the double-break isolator switch of Fig. 4, wherein the isolator switch is closed, and the grounding switch is disconnected.
Fig. 6: is a sectional drawing of the double-break isolator switch of Fig. 4, wherein the isolator switch is disconnected, and the grounding switch is disconnected.
Fig. 7: is a side sectional drawing of the double-break isolator switch of Fig. 4.

Detailed Description of Embodiments

To clarify the objectives, technical solutions and advantages of the present invention, the present invention will be explained in further detail below through embodiments.
It must be explained that in the absence of conflict, embodiments in the present application and features in embodiments can be combined with each other. The present application is explained in detail below with reference to the drawings, in conjunction with embodiments.
It must be noted that the terms used herein are intended merely to describe particular embodiments, not to limit exemplary embodiments according to the present application. As used herein, unless clearly indicated otherwise in the context, the singular form is also intended to include the plural form; in addition, it should also be understood that when the terms "include" and/or "comprise" are used herein, they indicate the existence of features, steps, operations, devices, assemblies and/or combinations thereof.
In addition, the terms "comprise" and "have" and any variants thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units which are clearly listed, but may comprise other steps or units which are not clearly listed or are intrinsic to such processes, methods, products or apparatuses.
Exemplary embodiments according to the present application are now described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in various forms, and should not be construed as being limited to the embodiments expounded here. It will be appreciated that these embodiments are provided in order to make the disclosure of the present application thorough and complete, and fully convey the concept of these exemplary embodiments to those skilled in the art. In the drawings, for the sake of clarity, the thickness of layers and regions might be expanded, and identical reference numerals are used to represent identical devices, so a description of these will be omitted.
Figs. 1, 2 and 3 show a first embodiment of the present invention. In this embodiment, a double-break isolator switch 1 comprises: a housing 2; a support 6, fixed in the housing 2; a first contact seat 7, a second contact seat 8 and a third contact seat 9, respectively disposed at a first side, a second side and a third side within the housing 2; a first moving contact 3, a second moving contact 4 and a third moving contact 5, slidably supported on the support 6 and respectively used to engage with the first contact seat 7, the second contact seat 8 and the third contact seat 9; and a connecting rod mechanism 10, connected to the first moving contact 3, the second moving contact 4 and the third moving contact 5, and driven by a driving mechanism 20, so as to drive the first moving contact 3, the second moving contact 4 and the third moving contact 5, such that the double-break isolator switch has a first working position and a second working position.
As shown in Fig. 1, in the first working position, the first moving contact 3 is engaged with the first contact seat 7 and the second moving contact 4 is engaged with the second contact seat 8, and at this time, the third moving contact 5 is separated from the third contact seat 9.
As shown in Fig. 2, in the second working position, the third moving contact 5 is engaged with the third contact seat 9, and at this time, the first moving contact 3 is separated from the first contact seat 7 and the second moving contact 4 is separated from the second contact seat 8.
Two isolation break points and one grounding break point are integrated in the double-break isolator switch 1, greatly reducing costs. Furthermore, mechanical interlocking and linked movement of a grounding switch and an isolator switch are achieved, i.e. when the isolator switch closes, the grounding switch will be certain to open, and when the isolator switch opens, the grounding switch will be certain to close, so safety is improved.
As shown in Figs. 1 and 2, the connecting rod mechanism 10 comprises: a first connecting rod 11 with a first end and a second end, the second end of the first connecting rod 11 being connected to a first end of the first moving contact 3; a second connecting rod 12 with a first end and a second end, the second end of the second connecting rod 12 being connected to a first end of the second moving contact 4; a third connecting rod 13 with a first end and a second end, the second end of the third connecting rod 13 being connected to a first end of the third moving contact 5; a connecting member 14 with a first part and a second part opposite the first part, wherein the first end of the first connecting rod 11, the first end of the second connecting rod 12 and the first end of the third connecting rod 13 are all connected to the second part of the connecting member 14; and a swing arm 15, connected to the first part of the connecting member 14 opposite the second part, wherein the swing arm 15 swings around an axis of a rotation shaft 16 under the driving action of the driving mechanism 20, thereby driving the connecting member 14 to move, and thus causing the first connecting rod 11 to drive the first moving contact 3, the second connecting rod 12 to drive the second moving contact 4, and the third connecting rod 13 to drive the third moving contact 5 to slide in the support 6.
Mechanical interlocking and linked movement of the grounding switch and the isolator switch are achieved through the simple structure of the connecting rod mechanism 10 described above, ensuring the safety and reliability of the isolator switch.
Further, as shown in Fig. 2, the first part of the connecting member 14 comprises a groove 17, and a second end of the swing arm 15 is connected in the groove 17 and slidable in the groove 17. During operation, the driving mechanism 20 drives the rotation shaft 16 to rotate, thereby driving the swing arm 15 to swing around the axis of rotation; as the swing arm 15 swings, it pushes the connecting member 14 to move, and at this time, the second end of the swing arm 15 slides in the groove 17. The cooperation of the connecting member 14 and the swing arm 15 by means of the groove 17 is structurally simple and highly reliable.
In addition, the rotation shaft 16 is arranged at a first end of the swing arm 15, and the driving mechanism 20 drives the rotation shaft 16 to rotate, thus causing the swing arm 15 to swing. The driving mechanism 20 comprises an electric motor.
In the present invention, the first connecting rod 11, the second connecting rod 12 and the third connecting rod 13 are all connected by pins 18 to the connecting member 14 and the corresponding first moving contact 3, second moving contact 4 and third moving contact 5, in order to be able to rotate relative to the connecting member 14 and the corresponding first moving contact 3, second moving contact 4 and third moving contact 5.
In addition, the double-break isolator switch further comprises a supporting member 19 fixed to a fourth side of the housing 2, for supporting the support 6.
The support 6 comprises: a first support part 61, the first moving contact 3 being arranged in the first support part 61 and slidable therein; a second support part 62, the second moving contact 4 being arranged in the second support part 62 and slidable therein; and a third support part 63, the third moving contact 5 being arranged in the third support part 63 and slidable therein. Inner surfaces of the first support part 61, the second support part 62 and the third support part 63 are each provided with: at least one guide ring 64, for guiding the first moving contact 3, the second moving contact 4 and the third moving contact 5 to slide; and a first contact finger 65, in contact with the first moving contact 3, the second moving contact 4 and the third moving contact 5 respectively, so that a corresponding electrically conductive circuit is formed when the isolator switch or grounding switch is engaged.
The first contact seat 7, the second contact seat 8 and the third contact seat 9 each comprise a second contact finger 66; when the first moving contact 3, the second moving contact 4 and the third moving contact 5 are correspondingly inserted in the first contact seat 7, the second contact seat 8 and the third contact seat 9, the second contact fingers 66 come into contact with the first moving contact 3, the second moving contact 4 and the third moving contact 5.
In the first working position as shown in Fig. 1, the double-break isolator switch is in a state in which the isolator switch is closed and the grounding switch is open.
In the second working position as shown in Fig. 2, the double-break isolator switch is in a state in which the grounding switch is closed and the isolator switch is open.
Specifically, as shown in Fig. 1, when the swing arm 15 swings anticlockwise under the driving action of the driving mechanism 20 via the rotation shaft 16, the second end of the swing arm 15 slides from right to left in the groove 17, causing the connecting member 14 to move down. Thus, the third moving contact 5 slides down in the third support part 63, thereby disengaging from the third contact seat 9. At the same time, the first moving contact 3 slides from right to left in the first support part 61, until fully engaged with the first contact seat 7; and the second moving contact 4 slides from left to right in the second support part 62, until fully engaged with the second contact seat 8. In this way, opening of the grounding switch and closing of the isolator switch are achieved in a mechanically linked manner.
As shown in Fig. 2, when the swing arm 15 swings clockwise under the driving action of the driving mechanism 20 via the rotation shaft 16, the second end of the swing arm 15 slides from left to right in the groove 17, causing the connecting member 14 to move up. Thus, the third moving contact 5 slides up in the third support part 63, thereby engaging with the third contact seat 9. At the same time, the first moving contact 3 slides from left to right in the first support part 61, thereby disengaging from the first contact seat 7; and the second moving contact 4 slides from right to left in the second support part 62, thereby disengaging from the second contact seat 8. In this way, closing of the grounding switch and opening of the isolator switch are achieved in a mechanically linked manner.
In addition, the double-break isolator switch according to this embodiment also has a third working position between the first working position and the second working position. When the double-break isolator switch is in the third working position, the first moving contact 3, the second moving contact 4 and the third moving contact 5 are respectively disconnected from the first contact seat 7, the second contact seat 8 and the third contact seat 9. That is to say, in the third working position, the grounding switch and the isolator switch are both disconnected.
The third working position is an intermediate working state between the first working position and the second working position.
The terms "up", "down", "left" and "right" mentioned above only provide a description in relation to the embodiment in Figs. 1 and 2, without defining a positional relationship in other embodiments.
In Fig. 3, the rotation shaft 16 is connected to the swing arm 15. Specifically, the rotation shaft 16 is inserted in the swing arm 15 by an interference fit. In addition, the rotation shaft 16 may be fixed to the swing arm 15 in other ways, e.g. fixed to the swing arm 15 by spline fitting or bolt connection. Of course, the present application does not rule out the use of other approaches to fix the rotation shaft 16 to the swing arm 15.
The driving mechanism 20 may be an electric motor located outside the housing 2, the electric motor being used to drive the rotation shaft 16, thereby driving the swing arm 15 to swing.
Figs. 4, 5, 6 and 7 show a second embodiment of the present invention, wherein the second embodiment and the first embodiment differ in the connecting rod mechanism 10. In the second embodiment, the connecting rod mechanism 10 comprises:

a first connecting rod 11 with a first end and a second end, the second end of the first connecting rod 11 being connected to the first end of the first moving contact 3;
a second connecting rod 12 with a first end and a second end, the second end of the second connecting rod 12 being connected to the first end of the second moving contact 4;
a third connecting rod 13 with a first end and a second end, the second end of the third connecting rod 13 being connected to the first end of the third moving contact 5;
a connecting member 14 with a first part and a second part opposite the first part, the first end of the first connecting rod 11 being connected to the first part of the connecting member 14, and the first end of the second connecting rod 12 and the first end of the third connecting rod 13 being connected to the second part of the connecting member 14;
the rotation shaft 16 of the driving mechanism 20 being connected to a middle part of the connecting member 14, so as to drive the connecting member 14 to rotate, thus causing the first connecting rod 11 to drive the first moving contact 3, the second connecting rod 12 to drive the second moving contact 4, and the third connecting rod 13 to drive the third moving contact 5 to slide in the support 6; the middle part being located between the first part and the second part.

In contrast to the first embodiment, the second embodiment does not use the swing arm 15; instead, the rotation shaft 16 is connected to the connecting member 14 directly. This connecting rod mechanism is structurally simple and highly reliable, achieving mechanical interlocking and linked movement of the grounding switch and the isolator switch, and ensuring the safety of the isolator switch.
In this embodiment, in addition to having a first working position (as shown in Fig. 5, the first moving contact 3 being engaged with the first contact seat 7 and the second moving contact 4 being engaged with the second contact seat 8, and at this time, the third moving contact 5 is separated from the third contact seat 9) and a second working position (as shown in Fig. 4, the third moving contact 5 being engaged with the third contact seat 9, and at this time, the first moving contact 3 is separated from the first contact seat 7 and the second moving contact 4 is separated from the second contact seat 8), the double-break isolator switch also has a third working position, as shown in Fig. 6. In the third working position, the first moving contact 3 is separated from the first contact seat 7, and the second moving contact 4 is separated from the second contact seat 8, and at the same time, the third moving contact 5 is separated from the third contact seat 9; in the third working position, the double-break isolator switch is in a state in which the isolator switch and the grounding switch are both disconnected.
Specifically, as shown in Fig. 4, the double-break isolator switch is in the second working position, i.e. the third moving contact 5 is engaged with the third contact seat 9, and at this time, the first moving contact 3 is separated from the first contact seat 7 and the second moving contact 4 is separated from the second contact seat 8. When the connecting member 14 rotates anticlockwise under the driving action of the driving mechanism 20 and the rotation shaft 16, the third moving contact 5 slides up in the third support part 63, thereby disengaging from the third contact seat 9. At the same time, the first moving contact 3 slides from right to left in the first support part 61, until fully engaged with the first contact seat 7; and the second moving contact 4 slides from left to right in the second support part 62, until fully engaged with the second contact seat 8. In this way, opening of the grounding switch and closing of the isolator switch are achieved in a mechanically linked manner, as shown in Fig. 5.
When the double-break isolator switch is in the first working position, i.e. the position shown in Fig. 5, when the connecting member 14 rotates clockwise under the driving action of the driving mechanism 20 and the rotation shaft 16, the third moving contact 5 slides down in the third support part 63, thereby engaging with the third contact seat 9. At the same time, the first moving contact 3 slides from left to right in the first support part 61, thereby disengaging from the first contact seat 7; and the second moving contact 4 slides from right to left in the second support part 62, thereby disengaging from the second contact seat 8. In this way, closing of the grounding switch and opening of the isolator switch are achieved in a mechanically linked manner.
In this embodiment, the double-break isolator switch also has the abovementioned third working position between the first working position and the second working position, as shown in Fig. 6. When the double-break isolator switch is in the third working position, the connecting member 14 can reach the first working position by rotating further anticlockwise. In addition, in the third working position, the connecting member 14 can reach the second working position by rotating further clockwise.
The terms "up", "down", "left" and "right" mentioned above only provide a description in relation to the embodiment in Figs. 4, 5 and 6, without defining a positional relationship in other embodiments.
As depicted in Fig. 7, the rotation shaft 16 is fixed to the connecting member 14 directly. Specifically, the rotation shaft 16 is inserted in the swing arm 15 by an interference fit. In addition, the rotation shaft 16 may be fixed to the swing arm 15 in another way, e.g. fixed to the connecting member 14 by spline fitting or bolt connection, etc.
The driving mechanism 20 may be an electric motor located outside the housing 2, the electric motor being used to drive the rotation shaft 16, thereby driving the swing arm 15 to swing.
The connecting member 14 has at least one recess 21. As shown in Fig. 7, the third connecting rod 13 is inserted in the recess 21, and rotatably connected to the connecting member 14 by means of a pin 18. The third connecting rod 13 is able to rotate in the recess 21 within a certain range.
Correspondingly, the first connecting rod 11 and the second connecting rod 12 may also be inserted in corresponding recesses 21 in the connecting member 14, and rotate in these recesses 21 in the same way as the third connecting rod 13; this is not shown in the figure.
The recess 21 is located at a middle position in a thickness direction of the connecting member 14. The recess 21 may run through the connecting member 14 in a transverse direction of the connecting member 14, thus giving the connecting member 14 a U shape, as shown in the sectional drawing of Fig. 7.
In summary, the double-break isolator switch 1 according to the present invention integrates two isolation break points and one grounding break point, realizing three working position states: opening of both isolation break points, with closure of the grounding break point; closure of both isolation break points, with opening of the grounding break point; and opening of both isolation break points, with opening of the grounding break point. These three states can be integrated in a single module, greatly reducing costs while improving safety. In addition, the grounding switch and the isolator switch are mechanically interlocked, enabling linked movement of the isolator switch and the grounding switch, thus improving safety and stability. The double-break isolator switch of the present invention is flexibly configured; an isolation or grounding function can be chosen according to actual needs.
Thus, it enables expansion, overhaul or testing without shutting off power.
To facilitate description, relative spatial terms such as "on...", "above...", "upper surface of...", "upper...", etc. may be used herein to describe a spatial position relationship between one device or feature and another device or feature, as shown in the drawings. It will be appreciated that relative spatial terms are intended to include different orientations in use or operation other than the orientations of devices depicted in the drawings. For example, if a device in the drawings is inverted, a device described as being "above another device or structure" or "on another device or structure" will thereafter be positioned as "below another device or structure" or "under another device or structure".
Thus, the exemplary term "above..." may include two orientations: "above..." and "below...". The device may also be positioned in other, different ways (rotated through 90 degrees or in another orientation), and the relative spatial descriptions used herein are interpreted accordingly.
In addition to the above, it should also be explained that the expressions "an embodiment", "another embodiment", "embodiment", etc. mean that the specific feature, structure or characteristic described in conjunction with this embodiment is included in at least one embodiment described in general terms in the present application. The same type of expression appearing in multiple places herein does not necessarily mean the same embodiment.
Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is to be asserted that the implementation of such a feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present application.
In the above embodiments, the description of each embodiment has its own emphasis; for any part that is not described in detail in a particular embodiment, the relevant description of another embodiment can be referred to.
The above are merely preferred embodiments of the present application, which are not intended to limit it; to those skilled in the art, various modifications and changes to the present application are possible. Any amendments, equivalent substitutions or improvements etc. made within the spirit and principles of the present application shall be included in the scope of protection thereof.

Reference numerals

1 - double-break isolator switch
2 - housing
3 - first moving contact
4 - second moving contact
5 - third moving contact
6 - support
61 - first support part
62 - second support part
63 - third support part
64 - guide ring
65 - first contact finger
66 - second contact finger
7 - first contact seat
8 - second contact seat
9 - third contact seat
10 - connecting rod mechanism
11 - first connecting rod
12 - second connecting rod
13 - third connecting rod
14 - connecting member
15 - swing arm
16 - rotation shaft
17 - groove
18 - pin
19 - supporting member
20 - driving mechanism
21 - recess

Claims

A double-break isolator switch, wherein the double-break isolator switch (1) comprises:
a housing (2);

a support (6) fixed in the housing (2),

a first contact seat (7), a second contact seat (8) and a third contact seat (9), respectively disposed at a first side, a second side and a third side within the housing (2);

a first moving contact (3), a second moving contact (4) and a third moving contact (5), slidably supported on the support (6) and respectively used to engage with the first contact seat (7), the second contact seat (8) and the third contact seat (9);

a connecting rod mechanism (10), connected to the first moving contact (3), the second moving contact (4) and the third moving contact (5), and driven by a driving mechanism (20), so as to drive the first moving contact (3), the second moving contact (4) and the third moving contact (5), such that the double-break isolator switch has a first working position and a second working position,

wherein, in the first working position, the first moving contact (3) is engaged with the first contact seat (7) and the second moving contact (4) is engaged with the second contact seat (8), and at this time, the third moving contact (5) is separated from the third contact seat (9),

wherein, in the second working position, the third moving contact (5) is engaged with the third contact seat (9), and at this time, the first moving contact (3) is separated from the first contact seat (7) and the second moving contact (4) is separated from the second contact seat (8).
The switch according to claim 1, wherein the connecting rod mechanism (10) comprises:
a first connecting rod (11) with a first end and a second end, the second end of the first connecting rod (11) being connected to a first end of the first moving contact (3);

a second connecting rod (12) with a first end and a second end, the second end of the second connecting rod (12) being connected to a first end of the second moving contact (4);

a third connecting rod (13) with a first end and a second end, the second end of the third connecting rod (13) being connected to a first end of the third moving contact (5);

a connecting member (14) with a first part and a second part opposite the first part, wherein the first end of the first connecting rod (11), the first end of the second connecting rod (12) and the first end of the third connecting rod (13) are all connected to the second part of the connecting member (14); and

a swing arm (15), connected to the first part of the connecting member (14), wherein the swing arm (15) swings around an axis of a rotation shaft (16) under the driving action of the driving mechanism (20), thereby driving the connecting member (14) to move, and thus causing the first connecting rod (11) to drive the first moving contact (3), the second connecting rod (12) to drive the second moving contact (4), and the third connecting rod (13) to drive the third moving contact (5) to slide in the support (6).
The switch according to claim 2, wherein the first part of the connecting member (14) comprises a groove (17), and a second end of the swing arm (15) is connected in the groove (17) and slidable in the groove (17).
The switch according to claim 3, wherein the rotation shaft (16) is arranged at a first end of the swing arm (15), and the driving mechanism (20) drives the rotation shaft (16) to rotate, thus causing the swing arm (15) to swing.
The switch according to any of the preceding claims, wherein the connecting rod mechanism (10) comprises:
a first connecting rod (11) with a first end and a second end, the second end of the first connecting rod (11) being connected to a first end of the first moving contact (3);

a second connecting rod (12) with a first end and a second end, the second end of the second connecting rod (12) being connected to a first end of the second moving contact (4);

a third connecting rod (13) with a first end and a second end, the second end of the third connecting rod (13) being connected to a first end of the third moving contact (5);

a connecting member (14) with a first part and a second part opposite the first part, the first end of the first connecting rod (11) being connected to the first part of the connecting member (14), and the first end of the second connecting rod (12) and the first end of the third connecting rod (13) being connected to the second part of the connecting member (14);

the rotation shaft (16) of the driving mechanism (20) being connected to a middle part of the connecting member (14), so as to drive the connecting member (14) to rotate, thus causing the first connecting rod (11) to drive the first moving contact (3), the second connecting rod (12) to drive the second moving contact (4), and the third connecting rod (13) to drive the third moving contact (5) to slide in the support (6);

the middle part being located between the first part and the second part.
The switch according to claim 5, wherein the double-break isolator switch also has a third working position, wherein, in the third working position, the first moving contact (3) is separated from the first contact seat (7), and the second moving contact (4) is separated from the second contact seat (8), and at the same time, the third moving contact (5) is separated from the third contact seat (9); in the third working position, the double-break isolator switch is in a state in which an isolator switch and a grounding switch are both disconnected.
The switch according to claim 2 or 5, wherein the first connecting rod (11), the second connecting rod (12) and the third connecting rod (13) are connected by pins (18) to the connecting member (14) and the corresponding first moving contact (3), second moving contact (4) and third moving contact (5) respectively, in order to be able to rotate relative to the connecting member (14) and the corresponding first moving contact (3), second moving contact (4) and third moving contact (5) respectively.
The switch according to claim 2 or 5, wherein the connecting member (14) has at least one recess (21), such that the connecting member (14) has a U shape, the first connecting rod (11), the second connecting rod (12) or the third connecting rod (13) being inserted in the recess (21), and rotatably connected to the connecting member (14) by a pin (18), so as to rotate within a certain range in the recess (21).
The switch according to claim 8, wherein the recess (21) is located at a middle position in a thickness direction of the connecting member (14).
The switch according to any of the preceding claims, further comprising a supporting member (19) fixed to a fourth side of the housing (2), for supporting the support (6).